That was also a while ago, if she tried that now I'm fairly sure she'd get banned.
It was 2 months ago (Nov '20) and she wasn't banned -
https://www.thewrap.com/kathy-griffin-re-posts-photo-of-fake-bloody-trump-head/ - but thats not a surprise is it, after all showing the bloody severed head of the President is apparently perfectly acceptable if you lean Left.
For me, using the excuse of art to cross line without punishment would be perfectly fine if, as I say again, it was allowed in both directions, but it's not. Hypocrisy never ever leads to peace and harmony between people, only division and anger and those going along with the hypocrisy just because it's on "your side" right now makes for echo chambers unable to see damage they're doing as they simultaneously call for a time of healing.
Angry people don't just go away when they get banned, they stay angry, their views stay unchallenged and grow harder whilst those screaming for bans congratulate themselves for a job well done as they silence another voice, completely oblivious to the very real danger that still exists and now can grow unchecked.